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PDF EM4095 Data sheet ( Hoja de datos )
| Número de pieza | EM4095 | |
| Descripción | Read / Write Analog Front End | |
| Fabricantes | EM Microelectronic | |
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EM MICROELECTRONIC - MARIN SA
EM4095
Read/Write analog front end for 125kHz RFID Basestation
Description
The EM4095 (previously named P4095) chip is a CMOS
integrated transceiver circuit intended for use in an RFID
basestation to perform the following functions:
- antenna driving with carrier frequency
- AM modulation of the field for writable transponder
- AM demodulation of the antenna signal modulation
induced by the transponder
communicate with a microprocessor via simple interface.
Features
Integrated PLL system to achieve self adaptive
carrier frequency to antenna resonant frequency
No external quartz required
100 to 150 kHz carrier frequency range
Direct antenna driving using bridge drivers
Data transmission by OOK (100% Amplitude
Modulation) using bridge driver
Typical Operating Configuration
Read Only Mode
LA +5V
CRES
CDV1
+5V
CDV2
RDY/CLK
1 16
2 15
3 14
4 EPM44009955 13
5 12
6 11
7 10
89
CDC2
CFCAP
SHD
DEMOD_OUT
MOD
CAGND
CDEC
µP
Data transmission by Amplitude Modulation with
externally adjustable modulation index using single
ended driver
Multiple transponder protocol compatibility
(Ex: EM400X, EM4050, EM4150, EM4070, EM4170,
EM4069….)
Sleep mode 1µA
USB compatible power supply range
40 to +85°C temperature range
Small outline plastic package SO16
Applications
Car immobiliser
Hand held reader
Low cost reader
Pin Assignment
VSS
RDY/CLK
ANT1
DVDD
DVSS
ANT2
VDD
DEMOD_IN
SO16
DC2
FCAP
SHD
DEMOD_OUT
MOD
AGND
CDEC_IN
CDEC_OUT
Fig. 1
Read/Write Mode
LA +5V
CRES
CDV1
+5V
CDV2
RDY/CLK
1 16
2 15
3 14
4 EPM440095 13
5 12
6 11
7 10
89
CDC2
CFCAP
SHD
DEMOD_OUT
MOD
CAGND
CDEC
µP
Fig. 3
Fig. 2
Copyright 2002, EM Microelectronic-Marin SA
1
www.emmicroelectronic.com
1 page  
EM4095
Timing Characteristics:
Parameters specified below are valid only in case the device is used according to Operating Conditions defined on previous
page.
VSS=DVSS=0V, VDD=DVDD = 5V
Parameter
Symbol Test Conditions
Typ Max Units
Set-up time after a sleep period
Tset
25 35 ms
Time from full power to modulation
state
Tmdon
antenna circuit specifications:
Q=15,FRES=125Khz
50 µs
modulation index: 100%
AM demodulation: Delay time from
input to output
Tpd Modulating signal 2Khz square
wave 10mVpp
40 100 µs
Recovery time of reception after
antenna modulation
Trec
Note 1
400 500
µs
Note 1: RF period is time of one period transmitted on ANT outputs (at 125 kHz 8µs). Trec after antenna modulation
receiver chain is ready to demodulate. The condition is of course that the amplitude on antenna has already reached its
steady state by that time (this depends on Q of antenna). See also Application Notes.
Block Diagram
VDD
VSS
SHD
AGND
FCAP
MOD
to all blocks
to all blocks
to all blocks
BIAS &
AGND
BIAS & AGND
to all blocks
LOCK
LOOP
FILTER
VCO &
SEQUENCER
SYNCHRO
HOLD
SHORT
DETECTION
& READY
ANTENNA
DRIVERS
RDY/CLK
DVDD
ANT1
ANT2
DVSS
DMOD_IN
SAMPLER
FILTER
COMPARATOR
DMOD_OUT
CDEC_OUT CDEC_IN DC2
Fig. 5
Copyright 2002, EM Microelectronic-Marin SA
5
www.emmicroelectronic.com
5 Page | ||
| Páginas | Total 10 Páginas | |
| PDF Descargar | [ Datasheet EM4095.PDF ] | |
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